I am also experiencing the same issue on Version 4.5.0.
Although it has nothing to with samba I am using SUSE Linux Enterprise Server 12 SP2 RC2 (x86_64).
Seeing the same lowercase and uppercase problem. It does not seem to interfere with samba functionality but needs to be tested throughly.
* Result for [DNSFOREST]: FAILURE
SUMMARY
---------
Attributes found only in ldap://microdc.xxx.xxx:
cn
dc
Attributes found only in ldap://sambadc.xxx.xxx:
CN
DC
ERROR: Compare failed: -1